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Title: Elastic analysis of bridge structures by the finite element method
Author: Lim, T. K.
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1971
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While in principle the finite element method is applicable to the analysis of any bridge type of any configuration, the practical application of the method is often limited by present day computer costs. A need, therefore, exists for more efficient elements and for further information on the problem of idealizing a structure. In parallel with the development of more refined methods, there is also the need for experimental verification. The work described here involves the development of a general purpose finite element computer program for application to the analysis of various bridge models recently tested at Imperial College. Some aspects of the work include the development of: (i) a basic quadrilateral plate bending element which is particularly suitable for use in rapidly varying stress fields in slab bridges (ii) a second order trapezoidal shell element which, since it has a biased, beam-like, in-'plane displacement field, is well suited to the analysis of box girder bridges (iii) a third order trapezoidal shell element which is particularly suitable for use in rapidly varying stress fields in box girder bridges (iv) beam-type elements "degenerated” from rectangular shell elements for use in a two-dimensional idealization of multi-cell bridge decks (v) a technique which enables an estimate of the local stresses in a slab to be made from a flexural analysis Model test results obtained for two curved continuous slab bridges, a curved box girder bridge, and a straight multi-cell bridge deck were used to demonstrate the accuracy and efficiency of the proposed elements in representing both the overall and local behaviour of such bridge structures. Some recommendations on element types and sizes are then made on the basis of these results. Finally, in a published work with other authors, a phenomenon- logical study was made of the structural behaviour of box girder bridges.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available